Tractor



J. DoNALDsoN 1,800,782

TRACTOR Filed Jan. 20, 1925 2 Sheets-Sheet l A 5 l -c 29 18A' "E 7AM 10D.e6 10c 1 ESA fnl@ 15 5 1211161 10110@ 'April 14, 1931. J. DQNALDSQNTRACTOR Filed Jan 2O 1925 2 Sheets-Sheet 2 FIGA. 25H

Patented Apr. 14, Y 1931 PATENT OFFICE JHN DONALDSON, OF DUNEDIN, OTAGO,NEW ZEALAND TRACTOR Application led January 20, 1925. Serial No. 3,677.

This invention relates to an oil driven tractor for agriculturalpurposes.

The object of the invention is to eliminate soil friction whiletravelling over cultivated soi p I accomplish the object by anarrangement of skeleton wheel construction, having grilpper members,which form the tread of t e said skeleton wheels and the said grippermembers adapted to grip firmly the cultivated soil at the bottom of thefurrow, all of the wheels in the tractor being driven.

Afurther object of the invention is to use the gripper members, formingthe tread of the skeleton wheel, while travelling over matted pastureland to cut into the surface thereof during ploughing operations.

The use of the tractor may be further extended toeliminate discing; thisis accom- 2o plshed by crossin and re-crossing the land at differentangles efore ploughing.

There is an arrangement whereby the tread of the skeleton wheels may beused, for the purpose ofcrushing clods; a suitable arrangement is asfollows.

A number of 6x1 hard wooden battens grooved along their centers and ateach end; the said battens are placed in position on the face of theWheel and parallel to the wheel axle.

In the drawing accompanying the specification,

Figure 1 is a side view of the tractor.

Figure 2 is a plan view of the tractor. Figure 3" is a cross sectionalelevation through line A-B, Fig. 1.

,Figure 4 is an end view of the tractor looking from the rear end.

Figure 5 is a plan view showing the reversing mechanism. p

Figure 6 is a half section of the front carriage showing a chain drive.

Figure 7 is a side elevation of Figure 6. Figure 8 is a detail of thetrunnion bear- Tigure 9 is a side view, the bearing being in section.

Figure 10 is a side elevation showing the casing of the idler pinion inthe front wheel drive.

Figure 11 is a side elevation with the cover removed.

Figure 12 is a section through C-D, Figure l1.

The following is a description of the invention.

There is a main frame member comprised of two channel steel joists 1 and1A, while having the one end of each member a suiiicient distance apartto allow for the engine 2, oo and necessary fittings, the other end ofeach said channel converges to a swivel joint member or trunnion 3. Fromthe said converging end of the main frame 1 and lAsecured thereto bymeans of straps 3A and 3B and 65 bolts inserted through openings 4, aretwo curved channel steel members 5 and 5A, which terminate at the top,having a collar like structure 6, which supports the front carriagerfand provides for a rotative support for such carriage, as indicated at7A.. There is an angle iron frame 8 secured to the main frame, the saidframe 8 provides support for the external portion of the skeleton wheelshafts 9. p

There are skeleton wheels 10 and 10A mounted and supported by the frame8, and the rear ends of the channel steel 1 and 1A. The wheels 10 and10A consist of three circular plates 10B, 10G and 10D, two external,10B, and 10D, andnone, 10C in the centre supporting the gripper platemembers 11, which are so constructed that they will have a maximum ofgripping power, (this relates particularly to soft subsoil) and at thesame S5 time, clear themselves when emerging from the ground. The insidesurface of each rear skeleton wheel has fastened to it an internal spurgear wheel 12.

In mesh with this wheel there are pinions, one of which is indicated at13, supported by the channel steel frames 1 and 1A and mounted on theback axles 15 and 15A. Between thepinion 13 and the differential gear17, there are reversing gear housings 16 and 95 16A. The reversing gearmounted in the housing 16 comprises a part of the back axles 15, havingsplines 15B thereon and a reduced diameter projecting into a shaft 15C,which has mounted thereon a pinion 15D splines 15B on the aXle 15. Thesaid pinion '15D is in constant mesh With a pinion 15G on the lay shaft15N s lidably mounted on Va stub axle; 15H3, and. upon or'iina;bearing;`15J? there isY av sleeve` p'art'- 15K progejcting Ifrom the slidablepinion 15G, Which has a. groove.

15L therein assoniatedi Withmechanism, in,- dicatedatlM. y

the lay shaft 15N, which, When shifted to reverse thegear, meshesWithanirrterfnal spur gear Wheel 15Q, and-at the same time disenagi'ngtliefparts/ 'andI 15Ev The," said gear Wheel 15Q, is keyedlto the backaxle,` 15'; At right' angles tta-axlesI 15 and "15A, ,therey istheengine Cardan shaft 18, having mountedi onf'its rearend abeyel!pinionl .1?9", which# is in mesh With a crown Wheel therebytransmittingthe impulse oaf-fthe motorto -the rear driving Wheels 10-andE 'lOby means of they dil'erentialf li''f, the engine 2" isL mountedon channel? steel frarn'esl andVlAL, preferably vin front otthelrearaxle'slf'A and4 15A, and isf ofthe heavy dutytype.Y 'llheclutches on theGar-dan Vshaft 158' are indicated at 18A and 118B; 'theyv areL similarinconstruction, and consist of' thevvel'l known plate clutchtype.

VIn the rear o-ftleiplate yclutchA 18B- there-isl a differentiall'meti'r'on corm'stingl of clutehf YInen'ibersy 18 and'lBDf, heldnormally in contact'Y bythes-pring' 18E the Whole contained isIaL-liousing` 18F. 'Elie purpose of: the said,v diilerential motion is toycompensate irregularity in speedsklv between front and rear Wheels;Member-s 221 and-'22-indicate cll'lt'ch and? 'foe-t' brake pedallevers,. which arei con@ fined to the engine 2. To the right hand sideofthe-engine therei's thef-steeringcoluinn 23, which by means'J ofi4 asleave 24g a! cli-ainy 251 and chain race 26? provides; the/means bytlie i'ontfcarriage thetraetor. Y

,'IliereV` is aj butler member-"26Bgfwhich isa segment,- tllearc oliwhich coincides witlithe Vperiphery ei"1 thee-chain; race 261, the@said" `builerfisl secured" to; theundersuracei of the main fir-ames"and2V 1Al by brackets! 26; adapted supportY theY said segrnenty by meansof a spindle 26D, which is) attached tofthef said4 segmenti2'6B spring26E holds the said segment in normal engagement with the chainr ace withferce toA prevent unduek stnaxinv` upon-1 the foresearriage, due to theorvvard motienI of thel tractor; The

. front carriage:frameL 7' consists mainlyl ofa channel steelf invertedjU shaped member orV yoke,vvh'ch supports t'llel front axle on whichis-m'ounte'd tlevtvvowheels 28; and28A. Above'the' shaftcentre; and*encircling the two'. Wheelr members 28ian'd 28A is anangle iron frame"29 and` the chain" race 26`- constructed" octcli'anneltsteel'.

is turned* tofsteerfy .gear'by meansotr ai 'propeller-,shaft y 130:tacones The said angle iron frame 29 is secured to the chain race 26 tostiffen the said race, which is also secured to the vertical members7,01 the inverted U shaped front carriag'e, as indicated at 26A, and Abythe diag'- onal stays 29A, so that the front carriage may turn ont itspivot "7B, When-operatedlbythe steering mechanism.

The front Wheels 28 and 28A areskeleton Wheels Whichconsistof cincnlarplates 28B Y a'nd'2`8C", Whi'cl'i arelixed tvo hubs 28E and 28F There isya second pinion 15P mounted enfmountable/upon the :iront aXle 27Ymounted on bearings. Fixed to the frame 7 on the innencizrculanplatesf28B and 28C, there are treads 28H secured to extend the` Width ofthe Wheel' and vto prevent it' fromr ysiifilting?too Y far into theground?.VV l -k H 'Upon-1 each vvlieelf25'-and:y 28Afare mountedinternal spur gearing Wlieel`s1`32 similar to those en rear YWheels 1 0and 1011494.V Tlieconstruction otwliiicltcensistspreferably pinious 33'and 33K, the spindles 34 andrl of which pass/through'. ramei'.,supporting' bearings landV 351A et the -frontcarr-iage. Secured: to thesaid spindlesr` 34E-1 Yandi idler casings 37:' andi 351A thefidlensffiand; 37C therein mesh-y Witliuthepifnionsfi and iand. tvv@Y otherltreeWheel;pinons eandr 38A. The. treemotiontef thefsaid' pinifons and88A is providedby.y elutclmenrbersig and* 38, Which transmit;diierentialimotion to1 thea Wheels. 28 and! 2849i ozttlle firent',carriage, for thepurpose of? compensating the irregularity of speedbet-ween.Y the ftWei iront Wheels, when, turning thetrantun;V

Ai cross` shaft 39g having' mounted the''r'fe'or's the said.v free Wheelpinions; 38f`andi 38A., `andi als@ ay bevel pinion'l9AA isisupprted?byfbearfv ings Ll0 and 40A' secured to the front carl-- riage` traine:7T. Bevel? pinionl 39A 'engages With-a bevelled crown Wheel41havingfteeth` on botl'rfaces; the crown Wheelsgarelhonsed above. thetrunnion'Y 7i' of: the'I lront c'arriage:-

Another shaft 4t2 isfsomounte in: a-r`netal casing and bearingllgtliatbevelpiniorEL/ vvill engage' with topfside-etcrownfwheel'dl.

all

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shortened andy supported.E by bearings. one v pair thereof beingindicated: at 481 andi/1&8@ in Fig-ure 6, sprocketpiniondisssubstiiutedfor the saidf pinion's, and? afspreclret is substituted orthe saidinternal spur geans; the v sprocket and?V Wlieelbeinfg couplediby thechain 51. YDirect Working' contact. isie'st'abfl lished betW-e'engtheengine -t'otle fnre=dnivihg universal oints 45 and 45A. K

There are drag chains 46 projecting rearwards from the main channelframes 1 and 1A being xed thereto, as indicated at 46A and 46B andsupported by a bar 47, which is attached to the angle iron frame 8.

What I claim as new and desire to secure by Letters Patent is A tractorincluding a rear horizontal rectangular frame, longitudinal frame barsextending longitudinally of and within the rectangular frame, said framebars extending in advance of the rear frame and converging to a bearingin the longitudinal median line of the rear frame, a forward frame of U-form arranged at a right angle to the rear frame, a frame bar rotativelyconnected to the forward frame and curving rearwardly and downwardly tosaid bearing, a circular chain race secured to the forward frame forcontrolling the rotative movement of the forward frame, said chain racebeing arranged in a plane parallel to and below the rear frame, a drivemeans operatively connected to the front wheel, a motor on the rearframe, and drive shafting including a section at the upper end of theframe bar, a section extending from the motor and an intermediatesection universally jointed at its, ends to said sections and spanningthe frame bearing.

In testimony whereof I aiiiX my signature.

JOHN DONALDSON.

